Check if dependencies installed

[VojtaStanek]

When running mango b I would like to see a warning when running without dependencies installed.

[enzy]

Is there any way to check this? Simple node_modules folder check isn't enough.

[FilipChalupa]

Something like this could help https://www.npmjs.com/package/check-dependencies

[enzy]

This means that we need package.json file, but we tried to avoid it from the project start.